I have just bought a car with R17 alloy wheels and 225/50R17 summer tyres, and I am looking for the winter tyres now. I am thinking of buying exactly the same size winter tyres and swapping them on the rims. In spring, I might change the tyres back and next winter buy new rims. Or do it already in spring. I may even end up not buying another set of rims at all, as I don't have space at home to store them, so not much saving on swapping/rebalancing. In any case, having the same size, in my opinion, gives me more flexibility and has no drawbacks.
I would like to know, if there are any disadvantages of such approach---so of using the same rims for winter and summer tyres and using relatively large and wide winter tyres (a lot of people are going for smaller winter wheels and narrow tyres---any advantages beyond price?).